Here is what you have to do. You have to throw a ball as hard as you can but it must return back to you even if it does not bounce at anything. Also, you have nothing attached to the ball. There is no one on the other end to catch that ball and throw it back at you.

How will you do it?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

A man embarked on a questionnaire game. He kept asking the same question to whomever he found. The answer each time was different.

Can you guess what the question was?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

A donkey is behind another donkey
I'm behind that second donkey
But there is a whole nation behind me

It is a murder you can describe in a word.

Can you count the number of triangles in the given picture?

Find the next number in the series.
1 10 24 43 67 ?

The answer I give is yes, but what I mean is no. What was the question?

An infinite number of mathematicians are standing behind a bar. The first asks the barman for half a pint of beer, the second for a quarter pint, the third an eighth, and so on. How many pints of beer will the barman need to fulfill all mathematicians' wishes?